Card transactions above €1 earn you 3% cashback in Grover Cash.
The main exceptions are:
Mail order or phone order transactions
Declined or expired reservations
Refunded payments
Payments to gambling companies
Investments
Transferring money to banks
For more details, check out the full list of excluded transactions.
You can earn a maximum of €60 per month in Grover Cash. Once you reach the €60 limit, you'll have to wait until the following month to restart earning Grover Cash.
For all the details, take a look at the General Terms and Conditions (section 13.3).